After a disappointing 5th birthday party, D.W. is transported to the magical island of Ukubonga, where she is crowned queen. Meanwhile, Arthur has skipped her birthday party to go on a school trip to the planetarium, and dreams about being four years in the future. D.W. gets bored on Ukubonga and realizes that she needs Arthur to keep her life interesting, while Arthur realizes how cool D.W. will be in the future and tries being nicer to her.